High strength steel plates for hydropower with low susceptibility to welding crack - Hydropower Plates - Bulldozer Tracks Parts, Dozer Undercarriage Parts Suppliers , Track Type Tractor Track Group

High strength steel plates for hydropower with low susceptibility to welding crack

Grade

600MPa：WDB620（Wuyang standard）, SX610CF（China Three Gorges Corp. standard）

800MPa：WSD690（Wuyang standard）, SX780CF（China Three Gorges Corp. standard）

Specs

Thickness（8～150）mm, Width（1500～3600）mm, Length（3000～16000）mm

Chemical composition (Melting analysis,%)

		Chemical composition* % (Quality score)

Grade	Thickness
	(mm)	C	Si	Mn	P	S	Cr	Ni	Mo	Cu	V	B
600MPa	≤	≤	≤0.40	1	≤	≤	≤	0.15	≤	≤	≤	≤
	80	0.07		～	0.015	0.005	0.5	～	0.5	0.3	0.05	0.003
	＞80	≤		1.6				1.5
	～	0.09
	≤120
	＞120	≤	≤0.40	1	≤	≤	≤	0.5	≤	≤	≤	≤
	～	0.1		～	0.015	0.005	0.6	～	0.5	0.3	0.05	0.003
	150			1.6				1.6
800MPa	≤	≤	≤	0.7	≤	≤	≤	0.5	≤	≤	≤	≤
	80	0.09	0.5	～	0.015	0.005	0.6	～	0.7	0.5	0.05	0.004
	＞80	≤		1.5				1.5
	～	0.1
	≤120
	＞120	≤	≤	0.7	≤	≤	≤	0.8	≤	≤	≤	≤
	～	0.11	0.5	～	0.015	0.005	0.7	～	0.7	0.5	0.05	0.004
	150			1.5				1.8
The supplier may add other elements to improve the plate performance with the content indicated in the quality certificate.

Smelting analysis of carbon equivalent（%）and Pcm（%）

		Ceq%	Pcm%

Grade	Thickness (mm)
600MPa	≤80	≤0.44	≤0.20
	＞80～≤120	≤0.46	≤0.23
	＞120～150	≤0.48	≤0.24
800MPa	≤80	≤0.52	≤0.25
	＞80～≤120	≤0.54	≤0.26
	＞120～150	≤0.56	≤0.28
a Ceq=C+Mn/6+Si/24+Ni/40+Cr/5+Mo/4+V/14

b Pcm=C+Si/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10+5B

Mechanical and technological properties

Grade		Yield strength	Tensile strength	Elongation ^b	Impact absorption energy		Impact energy^cabsorption after 5% strain aging		Cold-formed
		R_p0.2	R_m	A	℃	KV₂	℃	KV₂	α=180⁰
		MPa	MPa	%		J		J	b=2a
									D=3a
600MPa	≤80	≥490	610～750	≥17	-20	≥100	-20	≥100	No crack on the outer surface
	＞80～	≥470	590～730	≥17	-20	≥100	-20	≥100
	≤120
	＞120	≥450	570～730	≥17	-20	≥100	-20	≥100
	～150
800MPa	≤80	≥690	770～930	≥15	-40	≥100	-20	≥100	No crack on the outer surface
	＞80～≤120	≥670	750～920	≥15	-40	≥100	-20	≥100

	＞120	≥650	740～900	≥15	-40	≥100	-20	≥100
	～150
^{a It should be specified in the contract if Buyer shall specify the Z-direction performance which shall comply with the provisions of GB/T 5313.}
^{b A (δ5) represents the elongation at break when LO=5.65SO0.5, where L0 is the original gauge length and S0 is the original cross-sectional area.}
^{c The table shows the impact absorption energy index of the steel plate. The impact absorption energy at the corresponding temperature of the welded joint is}^≥^{47J. The test result is calculated according to the arithmetic mean of the three samples. One of the sample values is allowed to be lower but not less than 70% of the specified value.}

600MPa Steel plates for hydropower

Chemical composition (Melting analysis,%)

Heat No.	C	Si	Mn	P	S	Ni	Cr	Cu	Al	Mo	V	Nb	Ceq	Pcm	Thickness
Heat No.	C	Si	Mn	P	S	Ni	Cr	Cu	Al	Mo	V	Nb	Ceq	Pcm	Thickness
15407611N3	0.06	0.19	1.55	0.01	0.002	0.23	0.23	0.16	0.031	0.22	0.038	0.017	0.4357	0.19	32-60
15408120N3	0.06	0.19	1.57	0.008	0.002	0.23	0.21	0.16	0.032	0.23	0.041	0.019	0.4378	0.19	32-70
15104022N0	0.07	0.18	1.3	0.008	0.002	0.41	0.34	0.17	0.015	0.29	0.042	0.019	0.4479	0.2	110-115
15104225N0	0.07	0.19	1.31	0.006	0.002	0.42	0.34	0.16	0.024	0.29	0.043	0.017	0.4503	0.2	90-100
15105180N0	0.08	0.15	1.2	0.006	0.001	0.42	0.36	0.21	0.025	0.28	0.045	0.022	0.442	0.2	110

Product analysis of SX610CF Pcm distribution

High strength steel plates

Product analysis of SX610CF Ceq distribution

High strength steel plates

Mechanical properties

Lot No.	Specs	Heat treatment	Yield strength	Strength	Elongation	Direction1	－20℃ impact			Direction2	Impact value 1	Impact value 2	Impact value 3


GZA521708	32					horizontal	248	263	268	vertical	380	376	359
GZA521708	32	simulated post-weld				horizontal	270	291	287
GZA521708	32		600	677	21	vertical	299	294	279	horizontal	343	324	313
GZA521708	32	simulated post-weld	581	662	21.5	vertical	299	297	291
GZHA514311	45					vertical	289	253	297	horizontal	359	368	363
GZHA514311	45		576	657	20	horizontal	273	295	299	vertical	359	373	370
GZHA514311	45	simulated post-weld	562	649	21	vertical	238	287	281
GZHA514311	45	simulated post-weld				horizontal	296	263	299
GZHA514254	60		549	633	21.5	vertical	293	267	246	horizontal	318	348	325
GZHA514254	60					horizontal	271	282	299	vertical	335	338	338
GZHA514254	60	simulated post-weld	542	635	24	vertical	251	284	222
GZHA514254	60	simulated post-weld				horizontal	253	272	249

Lot No.	Specs	Heat treatment	Yield strength	Strength	Elongation	Direction	－20℃ impact			Direction 2	Impact value 1	Impact value 2	Impact value 3
GZHA514253	90		555	638	22.5	horizontal	261	250	267	vertical	316	336	331
GZHA514253	90					vertical	240	279	296	horizontal	273	236	338
GZHA514253	90	simulated post-weld	542	644	21.5	vertical	295	298	300
GZHA514253	90	simulated post-weld				horizontal	299	221	237
GZHA513771	110		538	626	21.5	horizontal	299	287	265	horizontal	270	279	218
GZHA513771	110					vertical	269	245	260	vertical	241	298	297
GZHA513771	110	simulated post-weld	561	644	19.5	horizontal	245	250	264
GZHA513771	110	simulated post-weld				vertical	271	258	289
GZHA513773	110		504	617	21	horizontal	263	291	292	horizontal	245	277	272
GZHA513773	110					vertical	299	299	293	vertical	300	287	275
GZHA513773	110	simulated post-weld	547	647	19.5	horizontal	247	276	255
GZHA513773	110	simulated post-weld				vertical	268	268	271

700MPa Steel plates for hydropower

Chemical composition (Melting analysis,%)

Heat No.	C	Si	Mn	P	S	Ni	Cr	Cu	Al	Ti	Mo	V	Nb	B	Ceq	Pcm
15408309N3	0.07	0.18	1.11	0.005	0.003	0.58	0.53	0.23	0.037	0.011	0.44	0.033	0.012	0.0009	0.4954	0.216
15408310N3	0.07	0.19	1.13	0.003	0.002	0.57	0.52	0.24	0.04	0.007	0.45	0.035	0.012	0.001	0.4995	0.219
15408311N3	0.07	0.17	1.16	0.005	0.003	0.59	0.52	0.25	0.04	0.012	0.44	0.031	0.009	0.0008	0.5014	0.218
15408312N3	0.07	0.19	1.13	0.003	0.001	0.58	0.52	0.26	0.022	0.006	0.43	0.031	0.01	0.0008	0.4945	0.217
15408660N3	0.07	0.19	1.14	0.01	0.002	0.55	0.54	0.23	0.041	0.012	0.43	0.031	0.01	0.001	0.4994	0.218
15408661N3	0.07	0.17	1.13	0.007	0.002	0.55	0.55	0.22	0.036	0.008	0.43	0.031	0.011	0.0008	0.4989	0.216
15408662N3	0.07	0.19	1.15	0.007	0.002	0.56	0.55	0.23	0.048	0.01	0.43	0.03	0.011	0.001	0.5032	0.219
15408733N3	0.07	0.14	1.15	0.006	0.003	0.57	0.54	0.22	0.035	0.006	0.43	0.032	0.01	0.0014	0.4995	0.219
15409496N3	0.08	0.16	1.17	0.007	0.003	0.56	0.54	0.21	0.029	0.005	0.45	0.032	0.01	0.001	0.5185	0.229
15409497N3	0.07	0.16	1.16	0.008	0.004	0.58	0.55	0.21	0.031	0.005	0.44	0.031	0.01	0.001	0.5067	0.218
15409742N3	0.07	0.13	1.15	0.008	0.002	0.57	0.56	0.22	0.03	0.004	0.44	0.034	0.011	0.0008	0.5058	0.217
15409743N3	0.07	0.13	1.14	0.008	0.002	0.57	0.56	0.22	0.032	0.004	0.44	0.034	0.011	0.0008	0.5041	0.217
15409744N3	0.07	0.17	1.16	0.006	0.003	0.56	0.54	0.21	0.033	0.004	0.45	0.031	0.011	0.001	0.5071	0.219
15409886N3	0.08	0.12	1.15	0.004	0.002	0.56	0.55	0.21	0.031	0.006	0.43	0.035	0.01	0.001	0.5107	0.226

Product analysis of SX780CF Pcm distribution

Product analysis of SX780CF Ceq distribution

Mechanical properties

Heat No.	Specs	Yield strength	Strength	Elongation	Impact	Impact value 1	Impact value 2	Impact value 3	Impact	Impact value 1	Impact value 2	Impact value 3
15408310N3	56	794	836	17	－40℃	232	211	252	－20℃	306	295	314
15408311N3	56	797	842	18	－40℃	256	190	241	－20℃	258	301	249
15408312N3	56	774	825	18	－40℃	216	239	237	－20℃	175	243	235
15408660N3	60	801	840	20	－40℃	258	200	227	－20℃	273	269	288
15408662N3	60	763	821	18.5	－40℃	261	260	258	－20℃	198	253	278
15408663N3	60	788	847	19	－40℃	211	199	208	－20℃	254	268	259
15408698N3	60	776	821	18	－40℃	284	253	274	－20℃	210	210	173
15408700N3	60	784	837	18	－40℃	252	283	259	－20℃	261	268	251
15408733N3	60	775	821	17.5	－40℃	237	268	248	－20℃	305	366	308
15408736N3	60	793	835	18	－40℃	165	176	190	－20℃	260	266	270
15409305N3	56	770	816	17	－40℃	206	211	196	－20℃	288	304	261
15409306N3	56	767	825	19	－40℃	240	271	250	－20℃	346	301	330
15409307N3	56	780	832	19.5	－40℃	200	204	241	－20℃	304	269	331
15409496N3	60	747	817	18	－40℃	236	235	260	－20℃	271	331	249
15409497N3	60	751	817	20	－40℃	164	168	175	－20℃	195	218	245
15409743N3	60	778	836	17.5	－40℃	282	300	284	－20℃	291	193	229
15409744N3	56	765	832	19.5	－40℃	260	299	153	－20℃	258	346	318
15409886N3	56	767	827	19	－40℃	190	152	199	－20℃	230	285	314

Bending performance

To verify the cold bending formability of WSD690E plate, cold bending tests are carried out respectively on 60mm, 85mm and 100mm plates with four diameters of bending centers d=1.5a, d=2.0a, d=2.5a and d=3.0a.

The test results show that the surfaces of 60mm, 85mm and 100mm plates after cold bending are good. Thus, WSD690E plate has good cold bending formability.

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